<template>
  <div>{{obj.msg}}</div>
</template>
<script setup>
import{reactive} from 'vue'
let obj= reactive({msg:'不畏浮云遮望眼，自缘身在最高层'});
setTimeout(()=>{
obj.msg='欲穷千里目，更上一层楼'
},5000)
</script>